Atmospheric carbon dioxide levels
a. drop in the winter.
b. drop in the spring.
c. drop in the summer.
d. drop in the fall.
e. always remain constant.
C
Biology & Microbiology
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The ____________________ closes off the larynx during swallowing. Fill in the blank(s) with the appropriate word(s)
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This class of antibodies is responsible for many allergies and may help protect against parasitic worm infections.
A. IgG B. IgC C. IgE D. IgD
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Antioxidants are believed to:
A) generate free radicals B) cause cancer C) destroy free radicals D) break down vitamins E) break down hydrogen peroxide
Biology & Microbiology